<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>后盾人</title>
  </head>
  <body>
    <script>
      // let number = new Number(99);
      // console.log(number.valueOf() + 1);
      // let number = 99;
      // console.log(typeof number);
      // let hd = number.toString();
      // console.log(typeof hd);

      let number = 99.556;
      // console.log(Number.isInteger(number));
      console.log(number.toFixed(2));
    </script>
  </body>
</html>
